Fig. 7From: Biological investigations on the freshwater snail Pirenella conica (Blainville, 1829) infected with the developmental stages of Heterophyes sp.HPLC chromatograms showing the dopamine (DA) and serotonin (5-HT) levels in clean uninfected (a) and infected (b) P. conica. 2, dopamine level; 3, serotonin levelBack to article page